Method and device for determining the optimal excitation value w

Details Method and device for determining the optimal excitation value w Method and device for determining the optimal excitation value w

1990-11-07

1991-12-24

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318767, 318799, 318254, H02P 516

Patent

active

050756125

ABSTRACT:
A method and an electronic device for determining the optimal excitation value (stator current, magnetic flux, magnetic induction) which minimizes the electromagnetic (copper and iron) losses of DC and vector-controlled AC machines. The invention provides the command to the excitation control loop of these electric machines, characterized by the multiplication or amplitude-modulation (1) of a periodic signal of angular frequency proportional to the speed of the electric machine, a first-order low-pass filter (2), an amplifier (3) and a peak detector (4). The output of the peak detector (4) provides the optimal command to the excitation control loop of the electric machine by a signal of amplitude proportional to the rotor current, i.sub.a.

REFERENCES:
patent: 3781616 (1973-12-01), Makrytzki et al.
patent: 4221983 (1980-09-01), Meurier
patent: 4868479 (1989-09-01), Byong-Ho et al.
patent: 4924156 (1990-05-01), Muller

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